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Deer eyes are specially equipped for evading dangerous predators. While the visual resolution of a deer's eyesight is about 12 times worse than that of a human, deer eyes are extremely effective at detecting movement. Deer eyes are also proportionally large for their body size, with very large pupil openings that allow them to see well in the dark.

A deer's eyes are able to take in about ten times as much light as those of a human. With their eyes set on the sides of their heads, a deer's visual field is about 310 degrees. In contrast, the visual field of a human is only about 200 degrees.